Television antenna



July 8, 1958 F. R. sHMlTT 2,842,765

TELEVISION ANTENNA Filed May 24. 1951 United States Patent O TELEVISION VANTENr'IA Franka. schmimnollis, N. Y.

Application May 24, 1951, Serial No. 227,964 achim. (clima-"126) This invention relates -toft'elevisin antenna, ymore particularlyfthe-type-to'receive hg'hand low "frequency signals.

It is among ithe objects-ofthe invention to'provide a television 'antenna that is neat, compact and has -but few inexpensive parts which may readily be assembled and are not likely to become deranged even after long use, which is highly responsive to incoming signals, which may readily be mounted and will withstand strong Winds with a minimum of vibration and hence a minimum of distortion and wavering in the picture being viewed.

According to the invention the television antenna comprises a pair of substantially circular conductive frames, one of larger diameter than the other and both mounted on an insulating member so that they lie in substantially the same plane with the center of the smaller frame lying within the circumference of the larger frame.

In the accompanying drawings in which is shown one or more of various possible embodiments of the several features of the invention,

Fig. 1 is an elevational view of the antenna,

Fig. 2 is a side elevational view thereof, and

Fig. 3 is a perspective view on an enlarged scale of the antenna mount.

Referring now to the drawings, the television antenna desirably comprises a length of conductive material pref erably tubular metal stock such as aluminum, bent into a substantially circular frame 11, the ends 12 of which are desirably attened.

Frame 11 is desirably mounted on one end of an insulating mount 14, preferably a substantially rectangular plate of insulating material, which extends radially inward from frame 11 toward the center thereof. Although the frame may be mounted on the plate 14 in any suitable manner, it is preferred to use bolts 15 which extend through plate 14 and through yaligned apertures in the flattened ends 12 of the frame 11.

Also mounted on plate 14 so as to be substantially concentric with frame 11 is a frame 16 which also desirably comprises a length of tubular metal stock such as aluminum which is bent into substantially circular shape and has a diameter less than that of frame 11. The adjacent ends 17 of frame 16 are also desirably flattened and are affixed to plate 14 by means of bolts 19, which extend through aligned openings in ends 17 and the other end of the plate 14, the frame 16 lying in substantially the same plane as frame 11.

Associated with frames 11 and 16 are a pair of rods or struts 22 and 23 also desirably of tubular aluminum stock each of which desirably has attened ends 24. The ends 24 of rods 22 and 23 are affixed to plate 14 by the bolts 19 so that said rods are electrically connected to frame 16. The rods 22 and 23 extend laterally outward from plate 14 in substantially opposed directions and the outer ends 24 of said rods are connected to the frame 11 as by bolts 26 which extend through aligned apertures in the flattened ends 24 and the frame 11.

2,842,765 Patented July 8, 1958 `Means are desirably provided securely, yet removably to mount the antenna to agpost 27. To this end, a sub- Yfs'ta'ntially U-shaped bracket 28, which may also be of aluminum, is aixed topplate 14 as by bolts 29, which fexterld through vthe base 31 of bracket 28 and through plate '14. The'ends 32 of bracket 28 are substantially parallel and extend outwardly from plate 14 at substantially rightangles thereto. each of said ends 32 desirably having'a substantially V-shaped notch 34 in the outer ledge thereof. Desirably an angle vmember 3S is positioned *on thebase 31 o'fbracket 28 between the ends 32 thereof,

the base 36 of angle member `35'resting on base 31 of bracketZS landthe outwardly extending portion 37 of angle member 35 extending parallel to ends 32 and hav- `ing a substantially V-shaped notch 38 in the outer edge thereof.

Inorder-securelytoclamp the antenna to the post 27, a -U-bolt41is desirably provided lying in a plane substantially -parallel to ends 32 of bracket 28 and outfs'tandin'g-member B7. `The=legs 42 of the U-bolt 41 extend through aligned apertures in bases 36 and 31 and in plate 14, being retained in place by means of nuts 43.

Thus, when the post is positioned in the V-shaped notches of ends 32 and outstanding member 37, encompassed by U-bolt 41, by merely tightening the nuts 43, the antenna will be securely mounted on said post.

In determining the dimensions of the frames 11 and 16 and the rods 22 and 23, it has been found that in the low frequency range of television signals which may, for example, have an average frequency in the order of 58.5 megacycles, the length of the frame 11 should be approximately 101 inches which is equal to one-half wave length of the average frequency to be received by said frame. At the high frequency range of television signals which may, for example, have an average frequency in the order of 182.5 megacycles, the length of the frame 16 should be approximately 32.4 inches which is also equal to one-half wave length of the average frequency to be received by said frame. Rods 22 and 23, which are connected to the frames 11 and 16, are desirably 16.2 inches in length which is equal to one-quarter wave length of a frequency of 182.5 megacycles. The rods 22 and 23 intercept the frame 11 at a distance of 50.5 inches from the ends 12 thereof so that the length of the frame between each of the outer ends of rods 22 and 23 and the adjacent flattened ends 12 is equal to one-eighth wave length of the low frequency of 58.5 megacycles. With the construction thus described, the optimum length of onehalf of the wave length of the signal to be received is provided for the frames 11 and 16 and this length is afforded in the minimum of space. In addition, the rods 22 and 23 which are electrically connected to the frame 16, add a further one-half wave length to such frame so that the frame 16 and associated rods 22 and 23 are tuned to one wave length of the signal to be received which is conducive to high eflciency reception.

By reason of the rods 22 and 23, not only is the efliciency of the antenna at a maximum for high frequency, which is generally more difficult to receive, but such rods reinforce the structure so that there will be but a minimum of vibration even in a strong wind and hence will avoid the distortion in the picture being viewed which usually occurs when a conventional elongated anrenna having unreinforced free ends is used.

The clamp mount above described though simple in construction, will securely retain the antenna on a post, yet may readily be loosened by unscrewing the nuts 43 to permit removal of the antenna. By reason of the intermediate angle member 35, when the U-bolt is tightened, there will be no bowing of the bracket 28 which might `move the frames 11 and 16 out of the same plane with possible distortion and reflections in the received signal.

As many changes could be made in the above construction, and many apparently widely different embodiments of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the -accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, what I claim as.,

new and desire to secure by Letters Patent of the United States is:

1. A television antenna comprising an insulating mount, a substantially circular conductive frame having a pair of adjacent ends affixed to one end of said in, sulating mount and extending outwardly therefrom, said mount lying in substantially the same plane as said frame and extending radially inward toward the center thereof, a second substantially circular conductive frame also having a pair of adjacent ends aiXed to said mount and extending outwardly therefrom near the inner end thereof, said second frame being of smaller diameter than said first frame and lying in substantially the same plane, said frames being clear of said mount except at the axed ends thereof, a pair of conductive rods afxed at one end respectively to the adjacent ends of said smaller frame and extending in substantially opposite directions, said rods being aixed at their outer ends to the circumference of said larger frame.

2. The combination set forth in claim 1 in which said frames are each of length substantially equal to one half of the average wave length of the frequencies to be received thereby respectively, and said rods are affixed to said larger frame at a distance from the adjacent ends thereof respectively equal to one-eighth of the average wave length of the frequencies to be received by the larger frame.

References Cited in the file of this patent UNITED STATES PATENTS 443,508 Emmet Dec. 30, 1890 524,282 McTighe Aug. 7, 1894 2,467,991 Raburn et al. Apr. 19, 1949 2,479,337 Fyler Aug. 16, 1949 2,551,664 Galper May 8, 1951 2,567,577 Pariser Sept. 11, 1951 2,644,888 Root July 7, 1953 

